Handling of oil painting originals in prepress production
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Oil painting is one of the main paintings in Western painting. Use quick-drying oil-toned blends to paint the art on a treated canvas, board, thick paper or wall. The oil painting manuscript differs from the Chinese painting manuscript in that it is mainly colored ink, and black ink plays a supporting role. The main feature of oil painting manuscripts is that they emphasize the stacking of pigments, the color is heavy, the contrast is strong, the contrast of colors is large, the brushwork and canvas are clear and the content is rich.
Because of the material, the color of the oil painting can be painted and rubbed, and can be dyed and scratched. Therefore, it can describe the three-dimensional and spatial sense of the image through the change of the color tone, and can also express the color of the light and the object. Therefore, it is necessary to pay attention to the processing. The picture should be based on CMY three primary colors. The three-color version should have a long tone and be full, while the black version should use a short black. It cannot be too long. It only plays the skeleton and outline. effect.
For the processing of the white field, it is necessary to pay attention to the color and light changes of the bright part of the picture, and maintain the layered texture of the bright part. In the calibration, for the brighter part of the brighter part, you should select the layered highlights as the white field calibration point; for some brighter parts, you can select the brightest part of the whole picture as the white. The calibration point of the field. The bright part of the oil painting original needs to be bright, but it does not affect the color of the original itself, faithfully reproduces its original color, and it is bright and not thin.
Oil painting pays great attention to the change of the dark level. Therefore, it is necessary to pay attention to keeping the dark tone level and color change of the original in the black field calibration. To be dark and not black, it can also be used to ensure a certain dark density. The original color of the dark tone is expressed. For general manuscripts, the black field calibration point is generally selected in the darkest part of the picture. Considering the color reproduction and neutral gray balance of the dark part, the value of the CMY three primary colors should be set higher, usually C95. %, M90%, Y90%. Due to the characteristics of the oil painting original, the black version has a shorter tone, and the value of the darkest part of the black version is generally 65%.
Attention should be paid to the saturation of the image in the processing of the intermediate tone. Oil painting originals are heavy in color, so the color saturation of the intermediate tone can be appropriately increased during processing, and attention should be paid to the change of each color in the picture, which cannot cause the color cast of the picture during the adjustment process. In fact, for any type of manuscript, it is very important to pay attention to maintaining the gray balance during the adjustment process. Neutral gray color cast will inevitably cause the color cast of other colors, and the overall picture will be color cast.
Due to the characteristics of oil painting-like original strokes and canvas textures, the requirements for sharpness are higher when dealing with such originals. In the process of processing, the amount of sharpening can be increased, the texture of the image is more intense, and the texture of the canvas, the change of the stroke and the three-dimensionality of the pigment accumulation are expressed.